Synthesis and structure of LaSr2CuTiO6.5: A new oxygen-deficient Ruddlesden-Popper phase

Gregory M. Sarjeant, Kevin B. Greenwood, Kenneth R. Poeppelmeier*, Hong Zhang, Paul A. Salvador, Thomas O. Mason, Laurence D. Marks

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


The structure of LaSr2CuTiO6.5, a novel (ABO3)nAO n = 2 Ruddlesden-Popper phase, has been solved by powder X-ray diffraction and electron microscopy. The diffraction patterns are consistent with I4/mmm symmetry, with tetragonal lattice parameters a = 3.8816(1) Å and c = 20.296(2) Å. The structure of LaSr2CuTiO6.5 is similar to Sr3Ti2O7, with copper and titanium disordered over the single B-cation site, and lanthanum and strontium almost perfectly disordered over the two A-cation sites. The oxygen content, determined by thermogravimetric reduction to be 6.5 (±0.1), is consistent with divalent copper with the oxygen vacancies distributed within the perovskite layers. The absence of local order and strategies for inducing a layered arrangement of the B-cations are discussed.

Original languageEnglish (US)
Pages (from-to)2792-2798
Number of pages7
JournalChemistry of Materials
Issue number12
StatePublished - Dec 1 1996

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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